﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class StringUtil
    {
       public static Boolean judeg(string str)
        {
            Boolean i = false;
            if (string.IsNullOrWhiteSpace(str))
            {
                i = true;
            }
            return i;
        } 
    }
}
